Answer
0.75
Explanation
The probability that a U.S college student chosen at random is below 25 years is:
[tex]\begin{gathered} =51\text{ \%} \\ =\frac{51}{100}=0.51 \end{gathered}[/tex]The probability that a U.S college student chosen at random is above 34 years is
Now, by addition law of probability, the probability that a U.S college student chosen at random is below 25 or above 34 years would be
[tex]\begin{gathered} 0.51+0.24 \\ =0.75 \end{gathered}[/tex]